Add plugin twitter for iOS.
Merge branch 'master' of https://github.com/cocos2d/cocos2d-x

Conflicts:
	plugin/samples/HelloSocial/proj.ios/HelloSocial.xcodeproj/project.pbxproj
Modify the license of plugin twitter.
Merge pull request #2839 from minggo/master

fix some memory leak
[Android] Don't use c++11 feature in OpenSLEngine.cpp.
[BB] Fixing compilation errors for CocoStudio runtime.
[TestCpp] Commenting the line of loading configuration file in TestCpp.
[BB] Updating project configuration after adding CocoStudio runtime.
[iOS] Adding i386 arch for MoonWarriors.
Merge pull request #2841 from dumganhar/master

Some fixes for Android, BB and iOS when testing. Please refer to commit for details.
Reverting TestCpp/AppDelegate.cpp to use config file. But modify it to a suitable value.
Merge pull request #2843 from dumganhar/master

Reverting TestCpp/AppDelegate.cpp to use config file. But modify its values to suitable ones.
Crash fix in CCControlColurPickerTest.
Merge pull request #2845 from dumganhar/master

[master] Crash fix in CCControlColurPickerTest.
Resolve the bug in the reflection of plugin.
Merge branch 'master' of https://github.com/cocos2d/cocos2d-x
Merge pull request #2846 from natural-law/master

Add twitter plugin for iOS
[win32] Updating TestLua.
Merge pull request #2848 from dumganhar/master

[win32] Updating TestLua.
[jsoncpp] Value::null -> Value::jsonNull to avoid conflict when compiling with clang++ or high version of gcc since null is defined as a key word.